hi, yeah got the Targas in the end. Really nice bindings!! I wanted a hard-charging, aggressive binding for mainly all-mountain, freeriding on groomers and powder, I've got park/FS specific setups. Personally, I wouldn't recommend these bindings for park or freestyle, they are too stiff! they have a lot of adjustability, whereas the Unions dont have any, but I'd say the unions are a bit softer and more of a "do-it-all" binding. It sounds like you want a binding to do it all so personally I'd recommend the atlas over the Targa's, purely because the targas are very responsive and not really made for lapping the park. That being said, if you're set on the targas, they can handle the park and fs riding, but imo there are better orientated bindings out there.

well im not any good in the park, never tried real snowpark, just some smaller things with friends. this year i want to spend 50 % time in the forest, riding powder and jumping some and 50 % in the park trying some grabs + boxes

I think Rome bindings vs Union bindings is like comparing chalk and cheese - on one hand you have a binding that incorporates a lot of customisation for each individual, on the other hand you have a binding which is ready out of the box!

The targas can be customised for FS riding, but imo are made for a more "serious" setup (hence why I use them on my Slayblade, use the stiff inserts on the ankle strap, and have lean angles on the highbacks). On the other hand the Atlas are ready out the box for all-mountain freestyle riding. Personally, I'm not a big fan of Union and find their bindings way over-hyped (I'm gonna get shot for bad mouthing Union!!) but if they work for you then go for them! I'm not a fan boy of any particular brand but I find Rome bindings the most comfortable, and I would suggest looking at the 390 Boss as a good all-rounder if you like Rome products.

Have a look and feel of them both, my guess is that the Unions will probably be lighter than the Rome. Also take your boots into the shop and try them on with the bindings (you may have to adjust the Rome's before they fit properly).